![]() ![]() Multiple rodenticides were detected in the livers of 38.4% of boobooks tested. A high percentage of boobooks were exposed (72.6%) and many showed potentially dangerous levels of AR residue (>0.1 mg/kg) in liver tissue (50.7%). My aim was to measure AR exposure in a common widespread owl species, the Southern Boobook (Ninox boobook) using boobooks found dead or moribund in order to assess the spatial distribution of this potential threat. To date no comprehensive assessment has been conducted on AR residues in Australian wildlife. ![]() Second generation anticoagulant rodenticides (SGARs) are highly persistent and have the potential to cause secondary poisoning in wildlife. Further studies are needed to investigate the exact pathway of this poison, especially the potential for invertebrates to carry poison.Īnticoagulant rodenticides (ARs) are commonly used worldwide to control commensal rodents. Sublethal effects such as lowered breeding success and stress may have affected morepork over a prolonged period following the poisoning operation. Secondary poisoning is implicated in the disappearance of these birds. Of these, 50% were not seen following the drop. A further eight banded and six non-banded birds were also monitored. ![]() Thus, three out of 14 birds died (21% mortality). The other two carcasses were not analysed, but they probably died as a result of brodifacoum poisoning. The bird found on day 22 contained 0.97 mg kg-1 of brodifacoum in its liver. One bird was found dead on day 22, and corpses of two radio-tagged birds were located on day 51. All 16 moreporks were alive after 13 days. We monitored 16 radio-tagged moreporks (Ninox novaeseelandiae) on Mokoia Island after a brodifacoum poison drop to eradicate mice (Mus musculus), normally included in the owls' diet. ![]()
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